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RT5021 是一款完整的電源管理解決方案,專為數位相機及其他手持式裝置設計。RT5021 整合多通道 DC/DC 電源轉換器、單節鋰離子電池線性充電器、充電器類型偵測功能,以及 I²C 控制介面,可大幅簡化系統電源架構設計。 其電源轉換器單元包含一組同步升壓轉換器(CH1)、一組同步升降壓轉換器(CH2)、三組同步降壓轉換器(CH3/CH4/CH5)、兩組最低輸入電壓可達 1.5V 的 LDO(CH6/CH8)、一組可工作於同步高壓升壓模式或低壓電流調節模式的 WLED 驅動器(CH7),以及一組供 RTC 應用使用的維持電源 LDO(CH9)。所有轉換器皆內建頻率補償與功率 MOSFET,並具備過電流保護、過溫保護、過電壓保護及欠壓保護等完整保護功能。此外,RT5021 內建 WAKEUP 脈衝產生電路,可監測 VIN 或電池安裝事件,並提供六組預設電源開啟與關閉時序,以滿足各類應用需求。 充電器部分整合自動電源路徑管理(APPM, Auto Power Path Management)功能,無需額外外接 MOSFET。當外部電源移除時,充電器可自動進入休眠模式以降低功耗。充電流程採用智慧控制演算法,可依據電池狀態自動切換預充電模式(Pre-Charge)、快速充電模式(Fast Charge)及定電壓模式(Constant Voltage)。充電電流亦可透過 I²C 介面進行設定。電池充電電壓與電流可依據 JEITA 溫度規範,或透過 I²C 設定其他充電策略進行調整。內建熱回授控制電路可根據晶片溫度自動調節充電速率,以最佳化各種環境溫度下的充電效率。當充電電流下降至快速充電電流的 10% 時,系統將於定電壓模式下自動終止充電。 RT5021 同時提供輸入欠壓保護及過壓保護,並內建 USB 充電器偵測功能,可透過 USB D+ 與 D− 腳位辨識標準下游埠(SDP)、充電下游埠(CDP)、專用充電埠(DCP)及 Apple/Sony 充電器類型。此外,RT5021 提供兩組開漏輸出訊號 CHG 與 CHG2,以及中斷輸出 INT,可即時回報充電狀態變化。 RT5021 透過 I²C 介面提供完整的電源轉換器與充電器功能控制,並採用 WQFN-40L 5mm × 5mm 封裝。
RT5021 電路圖
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<div class="spec-list"><ul class="lv1"><li>Power Converter Unit </li><li>CH1 LV Sync Step-Up <ul class="lv2"> <li></li><li>Support Up to 1A Loading, DVS (Dynamic Voltage Scaling), Load-Disconnect, Up to 95% Efficiency, PSM/PWM Selectable </li></ul> </li><li>CH2 LV Sync Step-Up/Down <ul class="lv2"> <li></li><li>Support Up to 1A Loading, DVS, Up to 95% Efficiency, PSM/PWM Selectable </li></ul> </li><li>CH3/4 LV Sync Step-Down <ul class="lv2"> <li></li><li>Support Up to 1.3A Loading, DVS, Up to 95% Efficiency, 100% (MAX) Duty Cycle, PSM/PWM Selectable </li></ul> </li><li>CH5 LV Sync Step-Down <ul class="lv2"> <li></li><li>Support Up to 0.6A Loading, Up to 95% Efficiency, 100% (MAX) Duty Cycle </li><li>Output Voltage can be Selected from Preset List or Set by External Feedback Network </li></ul> </li><li>CH6 Low Input Power LDO <ul class="lv2"> <li></li><li>V<sub>IN</sub> Range 1.5V to 5.5V </li><li>Output Voltage Level Selectable in I<sup>2</sup>C Register </li></ul> </li><li>CH7 WLED Driver in Either Sync Step-Up Operation or Current Regulator Operation <ul class="lv2"> <li></li><li>Step-Up Mode with LED Open Protection (OVP7 16V or 25V, Selectable in I<sup>2</sup>C Register) </li><li>Step-Up Mode Support Series 2 to 6 WLED and Load Disconnect Function </li><li>Current Regulator Mode for 1 WLED </li><li>31 WLED Dimming Levels </li><li>Automatic Mode Selection by External Circuit Topology </li></ul> </li><li>CH8 Generic LDO <ul class="lv2"> <li></li><li>V<sub>IN</sub> Range 1.5V to 5.5V </li><li>Output Voltage Level Selectable in I<sup>2</sup>C Register </li></ul> </li><li>CH9 Low Quiescent LDO with Reverse Leakage Prevention for RTC Power Supply <ul class="lv2"> <li></li><li>Fixed 3.05V Output </li></ul> </li><li>Six Preset Power On/Off Sequences by One Pin SEQ <ul class="lv2"> <li></li><li>SEQ

0 : CH2→CH3→CH4 </li><li>SEQ # 1 : CH1→CH3→CH2→CH4 </li><li>SEQ # 2 : CH1→CH3→CH4→CH2 </li><li>SEQ # 3 :

CH1→CH2→CH4→CH3 </li><li>SEQ # 4 : CH1→CH4→CH3→CH2 </li><li>SEQ # 5 : CH1→CH4→CH2→CH3 </li></ul> </li><li>All Power Switches Integrated with Internal Compensation </li><li>Discharge Output of Every Channels when Turning Off </li><li>Wake Up Impulse to Monitor BAT and VIN Plug-In </li><li>Fixed 2MHz Switching Frequency for CH1/3/4/5, Fixed 1MHz Switching Frequency for CH2/7Charger Unit </li><li>28V Maximum Rating for V<sub>IN</sub> Power </li><li>Selectable Power Input Current Limit (0.1A / 0.5A / 1A / 1.5A) </li><li>Auto Power Path Management (APPM) with Integrated Power MOSFETs </li><li>Battery Charging Current Control and Regulation Voltage Control </li><li>Programmable Charging Current and Safe Charge Timer </li><li>Optimized Charge Rate Via Thermal Feedback </li><li>Under Voltage Protection, Over Voltage Protection </li><li>Charger Status and VIN Power GOOD Indicators </li><li>Interrupt Indicator to JEITA Temperature/Fault/Status Events when PMU is Enabled <ul class="lv2"> <li></li><li>Battery Temperature Events </li><li>Battery Removing Event </li><li>Charger in Thermal Regulation Control </li><li>Safety Timer Timeout </li><li>End of Charging </li><li>VIN Power Good </li><li>VIN < DPM Threshold 4.35V </li><li>Charger Type Detection Finishing </li></ul> </li><li>Charger Type Detection <ul class="lv2"> <li></li><li>Dedicated Charger : Support Apple and Sony Charger </li><li>Secondary Charger Detection to Distinguish CDP and DCP </li></ul> </li><li>I<sup>2</sup>C Control Interface : Support Fast Mode up to 400kb/s </li><li>Small 40-Lead WQFN Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>

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RT5021 訂購資訊
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<div class="spec-list"><ul class="lv1"><li>DSC Power Supply System </li><li>CMOS-Sensor DV </li><li>Portable Instruments </li></ul></div>
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